Childhood Revisited - #16 - Thief: The Dark Project
If we were to curate some sort of videogame canon, Thief (or Dark Project as it was called in our homeland) would probably be part of it.
The classic stealth game by visionaries extraordinaires at Looking Glass (RIP) is one of the all-time great computer games. Does it hold up? Well, see for yourself. (SPOILERS: it does.)
The most interesting thing about it is probably that despite its influence, it's still very unique and almost idiosyncratic in its design. Almost all later stealth games approach the concept very differently.
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If you want to play it (you should), buy it on GOG: http://www.gog.com/game/thief_gold
You can also get its sequels Thief 2 (brilliant) and Thief 3 (not as great but still pretty good):
http://www.gog.com/game/thief_2_the_metal_age
http://www.gog.com/game/thief_3